Nitroglycerin is light-sensitive. That's why nitro talbets are contained in brown bottle. So is the injection fluid. we should protect it from light by not taking it out of carton unless we're ready to use. But i'm not sure whether or not we should wrap the bottle and line with foil during infusion. Just wrap it up with foil, it wouldn't hurt at all! And we usually use nipride for NS patients.